Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => EZ Board postings => Topic started by: Geezer on June 17, 2005, 08:29:05 pm
-
Hoffman Amplifiers
> Tube Amp Building - Tweaks - Repairs
> EL34LS Tube bias current
<< Prev Topic | Next Topic >>
Author Comment
xcpointx
Junior tube assistant
Posts: 1
(2/4/04 6:17 am)
EL34LS Tube bias current
--------------------------------------------------------------------------------
Hi
Ive got a matched quad of EL34LS's tubes from Groovetubes who state that these are rated at 30W and not the standard 25W that typically power Marshall amps.
What should I bias these too?
Any help or advice would be appreicated!
Thanks
Brandon
Edited by: xcpointx at: 2/4/04 6:17 am
GroundhogKen
Forum Moderator
Posts: 2239
(2/4/04 8:01 am)
Re: EL34LS Tube bias current
--------------------------------------------------------------------------------
Those are JJ E34L. You can try biasing then to 21 watts (70% of 30 watts).
That would be 46mA if your plate voltage is 450v. Watch for orange plates.
If they sound good at a cooler setting, leave them there and the they will last longer.
Ken
<< Prev Topic | Next Topic >>
Topic Commands
Click to receive email notification of replies
jump to: Tube Amp Building - Tweaks - Repairs (New)New Product Suggestions (New)Praises - Complaints - Suggestions (New)Buy - Sell- Trade (New)Archives (New)
- Hoffman Amplifiers - Tube Amp Building - Tweaks - Repairs - Hoffman Amplifiers -
Powered By ezboard® Ver. 7.32
Copyright ©1999-2005 ezboard, Inc.